56k line

A 56k line is a digital connection (possibly a leased line, possibly switched) capable of carrying 56 kilobits per second (kbps). Note that public telephone lines in Canada and the United States cannot carry 56 kbps, as CDOC[?] and FCC regulations limit the output power of modems in such a way as to limit throughput to 53 kbps, and the practical maximum over real phone lines is closer to 50 kbps.

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This article (or an earlier version of it) contains material from FOLDOC, used with permission.